Consolidated two stateless classes into one unified API: Dxf.Import(), Dxf.GetGeometry(), Dxf.ExportPlate(), Dxf.ExportProgram(). Export state moved into a private ExportContext. Removed bool+out pattern from GetGeometry in favor of returning empty list on failure. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>